TET2-mutant clonal hematopoiesis and risk of gout.

Agrawal M, Niroula A, Cunin P, McConkey M, Shkolnik V, Kim PG, Wong WJ, Weeks LD, Lin AE, Miller PG, Gibson CJ, Sekar A, Schaefer IM, Neuberg D, Stone RM, Bick AG, Uddin MM, Griffin GK, Jaiswal S, Natarajan P, Nigrovic PA, Rao DA, Ebert BL

Blood 140 (10) 1094-1103 [2022-09-08; online 2022-06-18]

Gout is a common inflammatory arthritis caused by precipitation of monosodium urate (MSU) crystals in individuals with hyperuricemia. Acute flares are accompanied by secretion of proinflammatory cytokines, including interleukin-1β (IL-1β). Clonal hematopoiesis of indeterminate potential (CHIP) is an age-related condition predisposing to hematologic cancers and cardiovascular disease. CHIP is associated with elevated IL-1β, thus we investigated CHIP as a risk factor for gout. To test the clinical association between CHIP and gout, we analyzed whole exome sequencing data from 177 824 individuals in the MGB Biobank (MGBB) and UK Biobank (UKB). In both cohorts, the frequency of gout was higher among individuals with CHIP than without CHIP (MGBB, CHIP with variant allele fraction [VAF] ≥2%: odds ratio [OR], 1.69; 95% CI, 1.09-2.61; P = .0189; UKB, CHIP with VAF ≥10%: OR, 1.25; 95% CI, 1.05-1.50; P = .0133). Moreover, individuals with CHIP and a VAF ≥10% had an increased risk of incident gout (UKB: hazard ratio [HR], 1.28; 95% CI, 1.06-1.55; P = .0107). In murine models of gout pathogenesis, animals with Tet2 knockout hematopoietic cells had exaggerated IL-1β secretion and paw edema upon administration of MSU crystals. Tet2 knockout macrophages elaborated higher levels of IL-1β in response to MSU crystals in vitro, which was ameliorated through genetic and pharmacologic Nlrp3 inflammasome inhibition. These studies show that TET2-mutant CHIP is associated with an increased risk of gout in humans and that MSU crystals lead to elevated IL-1β levels in Tet2 knockout murine models. We identify CHIP as an amplifier of NLRP3-dependent inflammatory responses to MSU crystals in patients with gout.

Abhishek Niroula

DDLS Fellow

PubMed 35714308

DOI 10.1182/blood.2022015384

Crossref 10.1182/blood.2022015384

pmc: PMC9461470
pii: S0006-4971(22)00804-7

Publications 9.5.0